Valve-motion



TTnn sTATEs PATENT oFFToE.

HORATIO O. PERRY, OF BUFFALO, NEW YORK.

VALVE-MOTION FOR OSCILLATING' ENGINES.

Specification forming part of Letters Patent No. 14,516, dated March 25, 1856; Reissued June 11, 1867', Nos. 2,645 and 2,646.

T0 all whom t may concern.'

Be it known that I, HoRA'rro O. PERRY, of the city of Buffalo, in the county of Erie and in the State of New York, have invented a new and Improved Valve and Valv-Motion for Steam-Engines, the Latter being Designed Only for Oscillating Steam- Engines; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon.

The nature of my invention consists in dispensing with a great portion of the cumbrous and expensive mechanism generally employed and obtaining an eiect precisely similar to that of the ordinary slide-valve by means of a rotary or rather a vibrating valve operated in a new and simple manner, partly by the aid of eccentrics and partly by the unavoidable motion of the cylinder. By properly proportioning the parts I obtain any desired amount of what is technically known as lead and lap, the facilities in these respects being precisely similar to those enjoyed in the use of the ordinary slide valve.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation: I so construct my oscillating cylinder that the ports are led close together, as in locomotive cylinders, but I hollow out the cylinder-face as represented in section in Figure 2, so that it will receive the valve V and fit closely to its cylindric face.

Fig. 1 is a general yperspective View of the engine. Fig. 2 is a vertical section through the valve V, the valve shaft S, the steam chest O, and the upper portion of the main cylinder P, like parts being designated by the same letters in both drawings.

I work the valve V Vby partially rotating it upon an axis. The valve is not tightly fixed upon the valve-shaft S, but is free to move a little vertically in order to allow for c wear or for any slight inaccuracy in the adjustment. The valve-shaft S projects through a stufling-box in the side of the steam-chest, and is provided with two arms,

. A and X, only one of which is in use at any one time. The arms project in nearly opposite directions, and when desiring to turn t-he engine in one direction I connect the extremity of the lower arm A, by means of the rod B, to the eccentric or cam C. It will be understood that the oscillating motion of the cylinder P is partaken of by the steam-chest O, the valve-shaft S, and to a certain degree by the extremity of the arm A; so that without deriving any motion from the eccentric a sufficient amountV o-f throw might be given the valve, but no lead would be obtained. I introduce the eccentric C either for the sole purpose of giving the desired lead to the valve, or of giving the lead and also increasing the throw.

When desiring to work in the reverse direction I disconnect the rod B from the arm A and connect the arm X by means of the eccentric rod Y yto the eccentric Z. As the oscillating motion of the cylinder is more felt by this arm by reason of its greater distance from the axis of the trunnions, I make the arm X longer than the arm A and as this increased length diminishes the effect of the eccentric I give the eccentric Z more throw than C. The proportionate dimensions o-f all these parts in any case may be determined by any competent person, as also the precise device most suitable for connecting and disconnecting the eccentric rods. In the drawing the eccentric rods are represented as hooking in opposite directions, and by elevating the lever, E, the pullies or rollers, F, F, are lifted, and both eccentric rods are raised until the upper one, Y, catches the pin X and gives a backward motion to the engine. On the contrary by depressing E, both rods are depressed until the rod B catches the arm A and a forward motion is the result.

To facilitate working by hand I prolong the valve-shaft S and provide its extremity with a socket G, in which I insert a starting bar at pleasure; and, to steady and support the valve-shaft S I provide the arm H fixe on the trunnion of the cylinder.

I do not claim the invention of rotating `or partially rotating valves loosely connected to shafts in the steam-chests, nor do I claim the opening and closing of ports by the oscillating motion ofthe cylinder, nor

do I claim broadly the working of valves partly by the motion of the cylinder and partly by the aid of eccentrics irrespective of the peculiar form and arrangement dethe loosely-attached, hollow-throated, and

scribed. partially rotating Valve, substantially as de- `What I claim as my invention and desire scribed and for the purposes herein set forth. 1t to secure by Letters Patent in oscillating HORATIO O. PERRY. engines is- Y Witnesses:

The Valve-motion above described as ar- JOHN D. .Sinin/ARD, ranged in relation to and in connection With HENRY MCLANE.

[FIRST PRINTED 1912.] 

